Origin

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They went on many adventures across the galaxy, working with many larger superhero organizations, like the X-men and Fantastic four. They also had Franklin Richards as an unofficial member.

When the team went through their first 'power switch', Julie gained the density power. She could turn into a cloud or go small and super dense. She was the first of the Pack to discover how to use this power to project water and air bubble forcefields.
In the next switch, she got her flying power back.
Early on in the series, she was the first of the Pack to demonstrate Kynellian healing powers when her arm broke but nearly healed the next day.

Her time with the Power Pack was shortly lived and Julie now seventeen decides to retire from the hero business and pursue her personal life. During a meeting with the Excelsior (Loners) she decides that she would like to take on an acting career, however she and the others agree to take on the mission offered to them. The goal of the mission was to bring in the Runaways. After the mission the decided that it was a one time thing and return to there support group.

Julie however feels the urge to make use of her powers again and dives of a building and soars through the sky.  When Julie intrudes during a battle between Hollow and Ricochet she is stabbed through the shoulders by Hollow, but fortunately her alien metabolism allowed her to heal from the wound quickly.

Powers

Main power: Flight, super speed

Other powers: Density control, forcefields, water bursts, energy blasts, gravity control, subconscious healing.

Explanation of powers

When Julie flies, she doesn't actually fly at light speed. Many people have been mislead due to her name and many other factors but actually all she does is fly and leave a trail of light behind her. It is known that she can break the sound barrier but her top speeds are unknown.

When she has the density power, she released her molecular structure to make herself like mist. She can also compact it to make herself small and dense. By manipulating particles around her body she can create air bubbles and forcefields and wind bursts.

Her healing power was transmitted when the pack gained their powers. Julie was the first to demonstrate it subconsciously early on when her arm was fractured. The other 4 siblings also have healing powers.

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Alternate Realities

Earth-91172

On Earth-91172, a world ravaged by the Hulk, Lightspeed is a member of the Next Wave of Heroes - the last heroes of earth. The members are Quentin Quire, Patriot, Wiccan, Lightspeed, Speedball and Sophie, Mindee and Esme Cuckoo.

Earth-58163

In the House of M reality Julie was member of the Wolfpack, a gang of super-powered sapiens.